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Analyse impédancemétrique pour le suivi de cuisson ou de santé des structures composites carbone/époxyde : Vers des matériaux intelligents pour le PHM des structures composites

Mahamadou Mounkaila 1
1 LAAS-MICA - Équipe MICrosystèmes d'Analyse
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : The high-performance composite materials based on carbon fiber are increasingly used in critical security areas (aeronautics and civil engineering) for the high mechanical performances as regards to their low density. They offer many benefits such as mechanical strength, mass and consumption reduction. Thus, it is important to know their characteristics during curing process or their use. With the aim to optimize their use or to control their integrity, efforts are employed by using several techniques to monitor their curing cycle or the health of the structures during the conditioning stage and the service stage. Beyond the existing methods of unique measurement of the resistance or the capacitance of the material, we present herein a technique of electrical impedance analysis to extract some specific material properties (resistance, capacitance, Impedance and argument) in order to know its behavior. As the microstructure of the material contains a conductor part (carbon fiber) and an insulator part (resin), a three-dimensional (3D) model of the electrical conduction in the material was established by using a network of a resistance RP connected in parallel with a capacitance CP (impedance Z) to describe the anisotropy of the material. Then, the thin flexible electrodes (flex) are inserted inside the material and the specific impedance measurement bench is developed to perform a real-time measurement of RP and CP or Z and θ. Spectroscopic impedance analysis of the studied samples informs about the intrinsic properties of material and shows a sensitivity of these electrical properties according to the curing cycle. Then the sensitivity to some physical parameters (temperature, deformations, etc.) will be demonstrated in order to provide necessary elements to know or predict the health of the material for SHM (Structural Health Monitoring) and PHM (Prognostics and health management) purpose.
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https://hal.laas.fr/tel-01813627
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  • HAL Id : tel-01813627, version 1

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Mahamadou Mounkaila. Analyse impédancemétrique pour le suivi de cuisson ou de santé des structures composites carbone/époxyde : Vers des matériaux intelligents pour le PHM des structures composites. Micro et nanotechnologies/Microélectronique. Université Toulouse 3 Paul Sabatier (UT3 Paul Sabatier), 2016. Français. ⟨tel-01813627⟩

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